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2002 Pontiac Grand Prix Failing Emissions

Tiny
BANDIT80
  • MEMBER
  • 2002 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 17,500 MILES
I have failed emissions twice now. Pulling codes for Heated 02, 02, Cat, Evap. Even though NO ck engine light comes on. I have replace 02 sensors and all sparkplugs. I have a new GM fuel pump (third one) and a I've replaced Cat Converter Twice! (About a year and a half old)
I think I have a underlying problem that is making me replace parts I may not need to.
I am going to clean my EGR valve next. Any Advice?
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Monday, July 20th, 2009 AT 5:33 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
The job of the EGR valve is to lower combustion temperature to prevent formation of oxides of nitrogen (NOX). Check it-it's probably stuck closed not circulating the exhaust gases.

Remove and clean it and base where pintle goes into.
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Tuesday, July 21st, 2009 AT 8:45 AM

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